Question

我正在尝试学习基本的iOS Swift3并使用故事板方法。我正在处理the tutorial on this website中的代码。

创建了FirstCustomSegue的故事板链接后，我编写如下代码;我为所有6个错误添加了评论：

class FirstCustomSegue: UIStoryboardSegue {

override func perform() {
    // Value of type 'FirstCustomSegue' has no member 'sourceGameViewController'
    var firstVCView = self.sourceGameViewController.view as UIView!
    var secondVCView = self.destinationGameViewController.view as UIView!

    // Cannot call value of non-function type 'UIScreen'
    let screenWidth = UIScreen.mainScreen().bounds.size.width
    let screenHeight = UIScreen.mainScreen().bounds.size.height

    secondVCView.frame = CGRectMake(0.0, screenHeight, screenWidth, screenHeight)

    // Cannot call value of non-function type 'UIApplication'
    let window = UIApplication.sharedApplication().keyWindow
    window?.insertSubview(secondVCView, aboveSubview: firstVCView)

    // Value of type 'FirstCustomSegue' has no member 'sourceGameViewController' (This is in the (Finished) line, of course)

    UIView.animateWithDuration(0.4, animations: { () -> Void in
        firstVCView.frame = CGRectOffset(firstVCView.frame, 0.0, -screenHeight)
        secondVCView.frame = CGRectOffset(secondVCView.frame, 0.0, -screenHeight)

    }) { (Finished) -> Void inself.sourceGameViewController.presentGameViewController(self.destinationGameViewController as UIViewController,
                animated: false,
                completion: nil)
    }
}

}

在我看来好像某处缺少连接，但我找不到它。也许其中一些是iOS10的变化？有些搜索建议这可能是UIScreen.mainScreen（）位的问题，但我找不到任何可以解决问题的东西。

Answer 1

我将您的代码重写为Swift 3.0风格。但是你使用Xcode 8吗？如果您使用Xcode 8，编译器可以帮助您修复语法错误。

class FirstCustomSegue: UIStoryboardSegue {

    override func perform() {
        let firstVCView: UIView = self.source.view
        let secondVCView: UIView = self.destination.view

        let screenWidth = UIScreen.main.bounds.size.width
        let screenHeight = UIScreen.main.bounds.size.height
        secondVCView.frame = CGRect(x: 0.0, y: screenHeight, width: screenWidth, height: screenHeight)

        let window = UIApplication.shared.keyWindow
        window?.insertSubview(secondVCView, aboveSubview: firstVCView)

        UIView.animate(withDuration: 0.4, animations: {
            firstVCView.frame = firstVCView.frame.offsetBy(dx: 0.0, dy: -screenHeight)
            secondVCView.frame = secondVCView.frame.offsetBy(dx: 0.0, dy: -screenHeight)
        }, completion: { [unowned self] finished in
            self.source.present(self.destination, animated: false, completion: nil)
        })
    }
}

您也可以自己将代码转换为最新的Swift语法 修改＆gt;转换＆gt;当前的Swift语法......
https://i.stack.imgur.com/niayG.png

Answer 2

您需要使用

UIApplication.shared

和

UIScreen.main

在Swift 3中的

。（暂不公开。）

Segue没有成员ViewController

2 个答案: